Fusible plug.



, PATENTED JAN. 21, 1908.

L. P. HACKER.

FUSIBLE PLUG.

APPLIOATION FILED 001223.190;

Lola's/ 4M Had/far useful improvements whereby the LOUIS PhUL ACKER, or BEAUMONT, Taxis This invention relates to fusible plugs for steam generators, and it has for its principal object to provide a plug replacing device easily insert a new plug when the water becomes so low as 'to'cause the initial plug to be fused, and this without danger of the fire becoming extinguished with the accompanying delay in bringing'up the boiler to normal steaming condition. 1

A furtherob ect of the invention is the provision of a plu replacing device comprising a rod or holfer permanently mounted in the boiler and accessible from outside and carrying a plurality of plugs which can be successively placed in the fuse holder in the.

crown sheet, as occasion requires.

shell boiler of any rod of such length With these objects in view andothers, as will appear as the description proceeds, the invention comprises the various novel features of construction and arrangement of.

arts which will be more ereinafter and set forth with particularity in the claims appended hereto.

In the accompanying drawing, which illustrates one of the embodiments of the invention, Figure 1 is a transverse section of a boiler showing the fusible plu replenishing device.- Fig. 2 is an enlarge view'of the device. v

Referring to the drawing, A designates a ap roved type to which is applied the device for replenishing the fuse plugs as the are melted out when the water becomes ow.- The device B comprises-a holder 1 preferably in the form of a as to extend from/the crown sheet A o the boiler to the top sheet or shell B and arranged on this ho der are spaced fuse plugs 2 disposed about an inch apart. The rod passes throu h a bushing 3 threaded in an opening I 4 in -t e shell of the boiler and is provlded packing t1ghtly with a chamber 5' there being a gland 7 for compressing the around the rod so that Specification 15; Letters Patent. I Application fileu DctoberZS. 1907- Berisl No. 398.833.

leakage of steam' will be fireman can quickly andfully described bringing rendering it unnecessary and at least the same distance be 0nd the shell,

for receiving a packing 6,

Patented aan. 21,1eoe.

effectually pre vented. In thenpper extremity therod is an enlargement 8 forming a grip whereby the rod can heactuated. Directly under the bushing. 3 -l:" a 'fu'sible plug holder 9 that lS'SBOllIGd-IIKO the o en'rng 10 in the crown sheet A, and thishdlderi-has acenical seat U forreceivinga ,2, the latter. being shaped to snugly t the seat .and form a steam ti ht 'ijfl iilt; steam wit u the boiler .acting: on. the top side of the plug The bottom sideoi the arge enough-to permitrthe' rod has .an 12 which is 1 to :be.

The pressure ref the will force the -plug -dorvn wardly tight. against its seat and'positively prevent leakage. plug holder 9 passed through. the same so 'that a 'new plug can be inserted when "one burns out.

practice, the partsare in the position shown, and when, for any reason, the water should become low enough, the :bottom or seated fusible plug will melt and as soon as the fireman becomes aware of the fact, he

merely pushes the rod 1 inwardly until the second fusible plug is firmly seated in the holder 9, thereby stopping the issuing of steam from enterin the fire box. After thus restoring the b0 or to normal condition, the pumps can be set into operation for The portion of the rod between the first and opening 12 and enter by the intense heat, graduall burn away. As the rod extends a consi erable distance above the boiler, all of the plugs can be successively inserted, as occasion requires, thus to open the boiler for replacing a fusible plug, the boiler being open when all of the plugs .have been used and a new device is required. The device is comparatively simple in construction and easy to operate and is sive.

" From the foregoing description, taken in connection with the accompanying drawrings, the advantages of the construction and of the method of operation will be readily apparent to those skilled in the art to which theinvention appertains, and while I have described the rmciple of operation fthe invention, toget er 'with the apparatus'which I now consider to be the best embodin'zent the water level back to normal.

extremely inexpen- I second fuse plug will pass through the the firebox and will,

thereof, desire to have it understood that "-plenishin'g'de'vice consisting of a ho 1; The combination of a boiler including .a'

shell and crown piece, with a-fusible 1 alug reer extending from the crown sheet to the shell and through the latter and mounted for longitu dinal movement, and a plurality'of fusible plugs rigidlysecuredthereto and arranged one above another.

,2; The combination of a boileriwith a fusible plug replenishingfldevice comprising a I holder mounted in'the boiler and extending.

therefrom, and a plurality of plugs carriedb the" holder for use in -successive order.

3'. Thecombin'a'tion of a boiler including, a

crown sheet and shell, a stufling'bo'x on the shell, and af fusible plug replenishing device.

com rising difnember extending through the ng boxl'o the plug holder and movable 'fgitudinall through the stufling box, 'and a p urality o lugstarranged on the holder.

1 4 The com ination of a boiler including two spaced'walls inclosing a steam space, a

fusible plug holder on one of the walls, and a sealing device'in the other wall, in combination with' a plug replenishing device comprising a lot! :tudmal y movable member of a length su stantially equal totwice the dis tance between the' walls and extending through the sealing device, and a plurality o fuse plugs fixed on a portion of the holder in the steamspace of the boiler.

5. The combination ofa fusible plug holder open from one side to the Other,,& plug-carrying member adapted to be moved through the opening of the holder, and a .lurality of plugs permanently attached to t e member, 1 in spaced relation.

' 6 As an article'of manufacture, a fusiblev plug" replenishing device comprising a memer,and 'a-plurahty of tapering plugs permanently secured thereto in fixed relation. 7. As an article of manufacture, a rod, and a'plurality of tapering plugs of fusible material permanently secured thereon in spaced relation, the same directio In testimony whereof I affix my signature in presence of two witnesses.

Witnesses: i

F. G. Pormnou, E. LARK. i

plugs being tapered alliinthe "LOUIS PAUL HACKER. 

